WEIRD PERFOMANCE ON LARGE MODELS

[DHABBYC]

Hello everyone,

 I'm having a lots of problems with the latest versions of gurobi (5.6.0 and 5.6.2). I'm running large (  3000000 rows and 560000 columns) MIP model. My SO is Ubuntu 13.10 and I have 16GB of RAM. Thing is that Gurobi 5.6.0 gets stuck after presolve (I mean forever), we change it to 5.6.2 and it runs, but this one gets stuck on a iteration of the root relaxation. Apparently it gets stuck when it finds the optimum for the relaxation (we know this value a priori). Now the weirdest thing: when gurobi is loading the model and executing presolve my machine starts swapping (which is normal when no more RAM is available), but when it starts the root relaxation the RAM consumption falls to (app) 4GB, but the machine still is swapping to the maximum amount and all the processors are 100% busy... and it stays that way  like forever (the iterations of the root relaxations took like 20 second each)...

Am I missing somenthing?? 

 Any ideas??

 Any help will be very much appreciated.

Regads.

D.

[Sonja Mars]

Hi,

Can you please post the log files of these runs?

Thanks,
Sonja

[DHABBYC]

Hi Sonja!

 Thanks for ypur reply. I'm pisting you the latest log from a model that got stuck on the root simplex... this time we did'nt see problems on swapping because this problem was run on a 256 GB server...

Gurobi 5.6.2 (linux64) logging started Thu Jan 30 13:46:13 2014

Read LP format model from file w23.lp

Reading time = 71.06 seconds

(null): 21845228 rows, 3564480 columns, 64419488 nonzeros

Optimize a model with 21845228 rows, 3564480 columns and 64419488 nonzeros

Found heuristic solution: objective -0

Presolve removed 0 rows and 0 columns (presolve time = 7s) ...

Presolve removed 1 rows and 0 columns (presolve time = 16s) ...

Presolve removed 9177433 rows and 0 columns (presolve time = 58s) ...

Presolve removed 9179873 rows and 2440 columns (presolve time = 76s) ...

Presolve removed 9179873 rows and 2440 columns (presolve time = 80s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 93s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 95s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 100s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 105s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 110s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 115s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 120s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 130s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 135s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 140s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 145s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 150s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 155s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 160s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 165s) ...

Presolve removed 9179921 rows and 2440 columns (presolve time = 179s) ...

Presolve removed 9187481 rows and 10000 columns (presolve time = 186s) ...

Presolve removed 9254181 rows and 76700 columns (presolve time = 194s) ...

Presolve removed 9254181 rows and 76700 columns (presolve time = 195s) ...

Presolve removed 9254181 rows and 76700 columns (presolve time = 200s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 210s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 210s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 223s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 225s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 230s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 253s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 255s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 260s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 265s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 270s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 275s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 280s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 285s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 290s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 295s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 300s) ...

Presolve removed 9254182 rows and 76700 columns (presolve time = 350s) ...

Presolve removed 9254182 rows and 76700 columns

Presolve time: 350.48s

Presolved: 12591046 rows, 3487780 columns, 38967700 nonzeros

Variable types: 0 continuous, 3487780 integer (3487780 binary)

Optimize a model with 12591046 rows, 3487780 columns and 38967700 nonzeros

Deterministic concurrent LP optimizer: primal simplex, dual simplex, and barrier

Showing barrier log only...

Presolve removed 0 rows and 0 columns (presolve time = 21s) ...

Presolve removed 0 rows and 0 columns (presolve time = 45s) ...

Presolve removed 0 rows and 0 columns (presolve time = 59s) ...

Presolve removed 0 rows and 0 columns (presolve time = 74s) ...

Presolve removed 0 rows and 0 columns (presolve time = 78s) ...

Presolved: 3487780 rows, 16078826 columns, 42455480 nonzeros

Root barrier log...

Elapsed ordering time = 5s

Elapsed ordering time = 10s

Elapsed ordering time = 15s

Elapsed ordering time = 20s

Elapsed ordering time = 25s

Elapsed ordering time = 30s

Elapsed ordering time = 35s

Elapsed ordering time = 54s

Elapsed ordering time = 59s

Elapsed ordering time = 65s

Elapsed ordering time = 74s

Elapsed ordering time = 76s

Elapsed ordering time = 80s

Elapsed ordering time = 85s

Elapsed ordering time = 90s

Elapsed ordering time = 95s

Elapsed ordering time = 100s

Elapsed ordering time = 105s

Elapsed ordering time = 110s

Elapsed ordering time = 115s

Elapsed ordering time = 120s

Elapsed ordering time = 125s

Elapsed ordering time = 130s

Elapsed ordering time = 135s

Elapsed ordering time = 140s

Elapsed ordering time = 196s

Elapsed ordering time = 204s

Elapsed ordering time = 207s

Elapsed ordering time = 211s

Elapsed ordering time = 216s

Elapsed ordering time = 222s

Elapsed ordering time = 226s

Elapsed ordering time = 230s

Elapsed ordering time = 235s

Elapsed ordering time = 240s

Elapsed ordering time = 245s

Elapsed ordering time = 250s

Elapsed ordering time = 255s

Elapsed ordering time = 260s

Elapsed ordering time = 265s

Elapsed ordering time = 270s

Elapsed ordering time = 275s

Elapsed ordering time = 280s

Elapsed ordering time = 285s

Elapsed ordering time = 290s

Elapsed ordering time = 295s

Elapsed ordering time = 342s

Elapsed ordering time = 356s

Elapsed ordering time = 361s

Elapsed ordering time = 365s

Elapsed ordering time = 371s

Elapsed ordering time = 375s

Elapsed ordering time = 380s

Elapsed ordering time = 385s

Elapsed ordering time = 390s

Elapsed ordering time = 395s

Elapsed ordering time = 400s

Elapsed ordering time = 405s

Elapsed ordering time = 410s

Elapsed ordering time = 415s

Elapsed ordering time = 420s

Elapsed ordering time = 425s

Elapsed ordering time = 430s

Elapsed ordering time = 493s

Elapsed ordering time = 495s

Elapsed ordering time = 506s

Elapsed ordering time = 510s

Elapsed ordering time = 517s

Elapsed ordering time = 520s

Elapsed ordering time = 525s

Elapsed ordering time = 530s

Elapsed ordering time = 535s

Elapsed ordering time = 540s

Elapsed ordering time = 545s

Elapsed ordering time = 550s

Elapsed ordering time = 555s

Elapsed ordering time = 560s

Elapsed ordering time = 565s

Elapsed ordering time = 570s

Elapsed ordering time = 575s

Elapsed ordering time = 580s

Elapsed ordering time = 585s

Elapsed ordering time = 590s

Elapsed ordering time = 595s

Elapsed ordering time = 600s

Elapsed ordering time = 605s

Elapsed ordering time = 610s

Elapsed ordering time = 615s

Elapsed ordering time = 620s

Elapsed ordering time = 640s

Elapsed ordering time = 649s

Elapsed ordering time = 653s

Elapsed ordering time = 655s

Elapsed ordering time = 661s

Elapsed ordering time = 665s

Elapsed ordering time = 670s

Elapsed ordering time = 675s

Elapsed ordering time = 680s

Elapsed ordering time = 685s

Elapsed ordering time = 690s

Elapsed ordering time = 695s

Elapsed ordering time = 700s

Elapsed ordering time = 705s

Elapsed ordering time = 710s

Elapsed ordering time = 715s

Elapsed ordering time = 720s

Elapsed ordering time = 725s

Elapsed ordering time = 730s

Elapsed ordering time = 735s

Elapsed ordering time = 740s

Elapsed ordering time = 745s

Ordering time: 772.83s

Barrier statistics:

 Dense cols : 94

 AA' NZ     : 2.638e+07

 Factor NZ  : 6.474e+09 (roughly 60.0 GBytes of memory)

 Factor Ops : 1.097e+14 (roughly 1200 seconds per iteration)

 Threads    : 26

                  Objective                Residual

Iter       Primal          Dual         Primal    Dual     Compl     Time

   0   1.11479499e+14  0.00000000e+00  3.57e+04 0.00e+00  9.13e+06  1355s

   1   7.43990590e+13 -5.85747352e+09  2.38e+04 6.44e+02  5.79e+06  1826s

   2   6.51915517e+13 -3.56762490e+09  2.08e+04 3.77e+02  4.63e+06  2300s

   3   4.89743456e+13 -2.31480243e+09  1.58e+04 2.25e+02  3.31e+06  2778s

   4   4.19195798e+13 -1.76317224e+09  1.36e+04 1.51e+02  2.72e+06  3246s

   5   3.29979029e+13 -9.83536684e+08  1.08e+04 7.69e+01  2.02e+06  3728s

   6   2.07212252e+13 -5.58509072e+08  7.13e+03 3.48e+01  1.22e+06  4229s

   7   5.37906451e+12 -2.61097643e+08  1.57e+03 5.89e+00  3.06e+05  4743s

   8   9.08188651e+11 -2.00772255e+08  2.23e+02 4.31e-01  5.08e+04  5264s

   9   2.06858284e+11 -1.85254837e+08  4.81e+01 1.14e-01  1.16e+04  5766s

  10   1.03466100e+11 -1.66048613e+08  2.33e+01 3.97e-02  5.79e+03  6277s

  11   6.24046344e+10 -1.44581961e+08  1.35e+01 1.86e-02  3.50e+03  6781s

  12   3.80628643e+10 -1.24051808e+08  8.25e+00 1.13e-02  2.13e+03  7281s

  13   1.71356346e+10 -8.46307379e+07  3.43e+00 3.70e-03  9.65e+02  7808s

  14   1.15719463e+10 -5.16928534e+07  2.43e+00 1.95e-03  6.48e+02  8320s

  15   8.14491565e+09 -1.68509944e+07  1.73e+00 1.05e-03  4.54e+02  8825s

  16   6.60507561e+09  3.09509799e+06  1.43e+00 7.69e-04  3.66e+02  9318s

  17   5.85810205e+09  8.01862133e+06  1.27e+00 7.21e-04  3.25e+02  9785s

  18   4.82174395e+09  2.70111647e+07  1.07e+00 5.61e-04  2.65e+02  10305s

  19   4.18215199e+09  3.70856509e+07  9.51e-01 4.95e-04  2.29e+02  10808s

  20   3.52503642e+09  5.87869892e+07  8.08e-01 3.77e-04  1.90e+02  11319s

  21   3.12531919e+09  7.89010717e+07  7.09e-01 2.85e-04  1.67e+02  11799s

  22   2.66136225e+09  9.73387879e+07  6.14e-01 2.21e-04  1.40e+02  12327s

  23   2.27707550e+09  1.07416134e+08  5.34e-01 1.93e-04  1.18e+02  12820s

  24   2.10306873e+09  1.18967996e+08  4.89e-01 1.65e-04  1.08e+02  13290s

  25   1.73610521e+09  1.30534781e+08  4.00e-01 1.42e-04  8.72e+01  13780s

  26   1.58428792e+09  1.40102167e+08  3.60e-01 1.24e-04  7.83e+01  14250s

  27   1.42721887e+09  1.51189938e+08  3.20e-01 1.06e-04  6.91e+01  14726s

  28   1.17411150e+09  1.65226011e+08  2.58e-01 8.75e-05  5.44e+01  15229s

  29   1.03869858e+09  1.74667379e+08  2.22e-01 7.73e-05  4.65e+01  15711s

  30   9.45723648e+08  1.82986770e+08  1.95e-01 6.94e-05  4.10e+01  16182s

  31   8.77966763e+08  1.93221512e+08  1.75e-01 6.08e-05  3.68e+01  16656s

  32   8.07306823e+08  2.15131852e+08  1.56e-01 4.46e-05  3.15e+01  17175s

  33   7.80163799e+08  2.22117216e+08  1.48e-01 4.00e-05  2.97e+01  17643s

  34   7.38875423e+08  2.30027073e+08  1.35e-01 3.50e-05  2.70e+01  18119s

  35   6.89131297e+08  2.40502190e+08  1.21e-01 2.91e-05  2.37e+01  18619s

  36   6.42894281e+08  2.51253143e+08  1.08e-01 2.38e-05  2.06e+01  19141s

  37   5.88184383e+08  2.62264168e+08  9.12e-02 1.93e-05  1.71e+01  19685s

  38   5.69566781e+08  2.67090252e+08  8.53e-02 1.75e-05  1.58e+01  20157s

  39   5.39759775e+08  2.75375463e+08  7.60e-02 1.48e-05  1.37e+01  20664s

  40   5.29321852e+08  2.78210334e+08  7.23e-02 1.39e-05  1.30e+01  21131s

  41   5.17778015e+08  2.81596741e+08  6.82e-02 1.29e-05  1.22e+01  21600s

  42   5.09764364e+08  2.85152630e+08  6.56e-02 1.18e-05  1.16e+01  22084s

  43   4.98775789e+08  2.88380537e+08  6.18e-02 1.09e-05  1.09e+01  22569s

  44   4.94528600e+08  2.90141425e+08  6.03e-02 1.04e-05  1.05e+01  23038s

  45   4.86838142e+08  2.91700034e+08  5.75e-02 9.94e-06  1.01e+01  23509s

  46   4.78724017e+08  2.94543678e+08  5.46e-02 9.19e-06  9.47e+00  23996s

  47   4.70136422e+08  2.96934604e+08  5.16e-02 8.60e-06  8.89e+00  24475s

  48   4.64666470e+08  2.98538775e+08  4.95e-02 8.21e-06  8.52e+00  24956s

  49   4.53633198e+08  3.02585659e+08  4.54e-02 7.27e-06  7.72e+00  25440s

  50   4.47051034e+08  3.03200836e+08  4.28e-02 7.14e-06  7.36e+00  25912s

  51   4.39721348e+08  3.05751739e+08  4.01e-02 6.60e-06  6.84e+00  26392s

  52   4.33245730e+08  3.06949212e+08  3.74e-02 6.36e-06  6.46e+00  26858s

  53   4.27911169e+08  3.07447326e+08  3.52e-02 6.26e-06  6.17e+00  27329s

  54   4.22229793e+08  3.10608012e+08  3.27e-02 5.65e-06  5.71e+00  27800s

  55   4.17830454e+08  3.11514835e+08  3.09e-02 5.49e-06  5.44e+00  28270s

  56   4.13154380e+08  3.13861869e+08  2.90e-02 5.08e-06  5.07e+00  28745s

  57   4.10708593e+08  3.14824916e+08  2.80e-02 4.91e-06  4.89e+00  29215s

  58   4.05141778e+08  3.18470269e+08  2.58e-02 4.32e-06  4.40e+00  29716s

  59   4.02628133e+08  3.20760381e+08  2.47e-02 3.96e-06  4.14e+00  30191s

  60   3.99761103e+08  3.21522520e+08  2.34e-02 3.83e-06  3.96e+00  30664s

  61   3.98687433e+08  3.23185184e+08  2.30e-02 3.57e-06  3.81e+00  31139s

  62   3.97665647e+08  3.23462878e+08  2.25e-02 3.52e-06  3.74e+00  31602s

  63   3.96618184e+08  3.23986247e+08  2.20e-02 3.44e-06  3.66e+00  32073s

  64   3.94479492e+08  3.25613710e+08  2.13e-02 3.99e-06  3.46e+00  32603s

  65   3.93079386e+08  3.27170977e+08  2.06e-02 3.61e-06  3.30e+00  33074s

  66   3.91342225e+08  3.28016010e+08  1.99e-02 3.46e-06  3.17e+00  33552s

  67   3.89436995e+08  3.29532155e+08  1.91e-02 3.44e-06  2.98e+00  34057s

  68   3.88273825e+08  3.30139101e+08  1.85e-02 3.31e-06  2.90e+00  34531s

  69   3.83703344e+08  3.32365896e+08  1.66e-02 3.10e-06  2.55e+00  35045s

  70   3.81237708e+08  3.33703076e+08  1.54e-02 3.00e-06  2.35e+00  35523s

  71   3.79678224e+08  3.34383524e+08  1.47e-02 3.22e-06  2.24e+00  36023s

  72   3.77511900e+08  3.35641234e+08  1.37e-02 3.25e-06  2.07e+00  36529s

  73   3.77030711e+08  3.35722052e+08  1.35e-02 3.47e-06  2.04e+00  37001s

  74   3.74427401e+08  3.37737010e+08  1.24e-02 3.73e-06  1.80e+00  37531s

  75   3.73847487e+08  3.38269578e+08  1.21e-02 4.25e-06  1.74e+00  38004s

  76   3.71886274e+08  3.39274562e+08  1.11e-02 3.52e-06  1.59e+00  38504s

  77   3.70993538e+08  3.39792958e+08  1.07e-02 3.73e-06  1.52e+00  38974s

  78   3.70021381e+08  3.40050390e+08  1.02e-02 3.52e-06  1.46e+00  39451s

  79   3.68800291e+08  3.41423932e+08  9.62e-03 3.93e-06  1.32e+00  39962s

  80   3.67378612e+08  3.42334852e+08  8.87e-03 3.87e-06  1.21e+00  40446s

  81   3.66548227e+08  3.43316772e+08  8.47e-03 4.22e-06  1.11e+00  40964s

  82   3.65843520e+08  3.43652047e+08  8.10e-03 4.17e-06  1.06e+00  41445s

  83   3.64721874e+08  3.44909510e+08  7.55e-03 4.05e-06  9.38e-01  41942s

  84   3.63532430e+08  3.45711606e+08  6.93e-03 4.32e-06  8.38e-01  42439s

  85   3.63228099e+08  3.45837081e+08  6.75e-03 3.89e-06  8.18e-01  42907s

  86   3.62466467e+08  3.46718831e+08  6.35e-03 4.59e-06  7.33e-01  43432s

  87   3.62023531e+08  3.46814894e+08  6.09e-03 4.08e-06  7.09e-01  43903s

  88   3.61618402e+08  3.47147228e+08  5.84e-03 4.80e-06  6.73e-01  44380s

  89   3.61005246e+08  3.47485001e+08  5.49e-03 5.13e-06  6.27e-01  44870s

  90   3.60622616e+08  3.47670908e+08  5.26e-03 5.02e-06  6.01e-01  45346s

  91   3.59890547e+08  3.47955245e+08  4.86e-03 4.47e-06  5.53e-01  45840s

  92   3.59265993e+08  3.48226544e+08  4.49e-03 5.29e-06  5.11e-01  46321s

  93   3.59042899e+08  3.48347743e+08  4.35e-03 5.14e-06  4.95e-01  46791s

  94   3.58800229e+08  3.48422064e+08  4.20e-03 5.07e-06  4.81e-01  47265s

  95   3.58039296e+08  3.48971966e+08  3.77e-03 4.83e-06  4.17e-01  47799s

  96   3.57332375e+08  3.49110464e+08  3.34e-03 5.28e-06  3.80e-01  48308s

  97   3.57108939e+08  3.49216739e+08  3.19e-03 5.32e-06  3.65e-01  48799s

  98   3.56888125e+08  3.49456528e+08  3.06e-03 5.19e-06  3.42e-01  49286s

  99   3.56678138e+08  3.49531386e+08  2.92e-03 5.71e-06  3.30e-01  49757s

 100   3.56477121e+08  3.49676062e+08  2.79e-03 5.28e-06  3.14e-01  50229s

 101   3.56147688e+08  3.49844533e+08  2.58e-03 5.51e-06  2.91e-01  50701s

 102   3.55791181e+08  3.50102267e+08  2.35e-03 5.99e-06  2.62e-01  51185s

 103   3.55497562e+08  3.50160038e+08  2.16e-03 5.62e-06  2.47e-01  51682s

 104   3.55336230e+08  3.50193018e+08  2.05e-03 5.63e-06  2.39e-01  52156s

 105   3.55153797e+08  3.50379811e+08  1.93e-03 5.77e-06  2.21e-01  52637s

 106   3.54982429e+08  3.50559246e+08  1.81e-03 5.84e-06  2.04e-01  53114s

 107   3.54781040e+08  3.50695378e+08  1.68e-03 5.65e-06  1.88e-01  53602s

 108   3.54623650e+08  3.50807323e+08  1.57e-03 5.53e-06  1.75e-01  54099s

 109   3.54428357e+08  3.51001628e+08  1.44e-03 5.74e-06  1.57e-01  54576s

 110   3.54294760e+08  3.51092099e+08  1.34e-03 5.56e-06  1.46e-01  55052s

 111   3.54112948e+08  3.51229728e+08  1.28e-03 6.44e-06  1.31e-01  55555s

 112   3.54006999e+08  3.51363019e+08  1.21e-03 6.26e-06  1.20e-01  56029s

 113   3.53831645e+08  3.51469877e+08  1.14e-03 6.08e-06  1.06e-01  56563s

 114   3.53740704e+08  3.51568380e+08  1.07e-03 6.57e-06  9.74e-02  57042s

 115   3.53656079e+08  3.51668742e+08  1.02e-03 6.47e-06  8.84e-02  57523s

 116   3.53553601e+08  3.51700159e+08  9.73e-04 6.20e-06  8.28e-02  58020s

 117   3.53391923e+08  3.51811951e+08  8.73e-04 6.68e-06  7.03e-02  58508s

 118   3.53313396e+08  3.51845806e+08  8.27e-04 6.88e-06  6.56e-02  58972s

 119   3.53272082e+08  3.51929295e+08  8.00e-04 7.50e-06  5.92e-02  59465s

 120   3.53207779e+08  3.51965492e+08  7.62e-04 7.42e-06  5.47e-02  59941s

 121   3.53140038e+08  3.51990259e+08  7.32e-04 7.36e-06  5.09e-02  60402s

 122   3.53041649e+08  3.52036878e+08  6.44e-04 7.84e-06  4.47e-02  60869s

 123   3.53007314e+08  3.52076495e+08  6.12e-04 7.51e-06  4.12e-02  61347s

 124   3.52959228e+08  3.52098841e+08  5.69e-04 7.90e-06  3.82e-02  61814s

 125   3.52941408e+08  3.52114941e+08  5.55e-04 7.76e-06  3.66e-02  62287s

 126   3.52879215e+08  3.52146727e+08  5.03e-04 7.39e-06  3.26e-02  62762s

 127   3.52809196e+08  3.52191211e+08  4.53e-04 7.73e-06  2.74e-02  63251s

 128   3.52785501e+08  3.52201676e+08  4.45e-04 8.17e-06  2.60e-02  63719s

 129   3.52781517e+08  3.52211023e+08  4.44e-04 7.99e-06  2.53e-02  64212s

 130   3.52725441e+08  3.52241029e+08  4.33e-04 6.66e-06  2.16e-02  64714s

 131   3.52713210e+08  3.52264374e+08  4.30e-04 6.68e-06  1.98e-02  65198s

 132   3.52664974e+08  3.52326308e+08  4.32e-04 6.72e-06  1.44e-02  65764s

 133   3.52590382e+08  3.52353788e+08  3.53e-04 6.38e-06  1.02e-02  66282s

 134   3.52568357e+08  3.52372188e+08  3.38e-04 5.48e-06  8.39e-03  66778s

 135   3.52560049e+08  3.52378589e+08  3.21e-04 5.36e-06  7.74e-03  67257s

 136   3.52553728e+08  3.52382444e+08  3.09e-04 5.26e-06  7.31e-03  67721s

 137   3.52547203e+08  3.52386822e+08  2.95e-04 4.96e-06  6.84e-03  68186s

 138   3.52534302e+08  3.52395415e+08  2.73e-04 5.10e-06  5.90e-03  68664s

 139   3.52528163e+08  3.52400705e+08  2.63e-04 4.57e-06  5.36e-03  69154s

 140   3.52518002e+08  3.52413000e+08  2.51e-04 3.28e-08  4.31e-03  69635s

 141   3.52482502e+08  3.52418187e+08  1.32e-04 6.74e-06  2.87e-03  70124s

 142   3.52466435e+08  3.52428713e+08  8.78e-05 1.48e-06  1.73e-03  70622s

 143   3.52461240e+08  3.52432715e+08  7.40e-05 8.94e-08  1.33e-03  71111s

 144   3.52460450e+08  3.52437697e+08  7.22e-05 7.07e-07  1.01e-03  71583s

 145   3.52457038e+08  3.52438675e+08  5.87e-05 7.64e-07  8.47e-04  72054s

 146   3.52450487e+08  3.52442437e+08  7.97e-05 5.67e-07  4.26e-04  72543s

 147   3.52450395e+08  3.52444472e+08  7.58e-05 3.78e-07  3.03e-04  73070s

 148   3.52449405e+08  3.52445044e+08  3.51e-05 3.26e-07  2.36e-04  73559s

 149   3.52449018e+08  3.52446151e+08  1.72e-05 2.25e-07  1.58e-04  74050s

 150   3.52448744e+08  3.52447205e+08  5.89e-06 1.27e-07  8.66e-05  74540s

 151   3.52448703e+08  3.52447711e+08  4.31e-06 8.13e-08  5.55e-05  75060s

 152   3.52448644e+08  3.52448226e+08  1.59e-06 6.29e-08  2.35e-05  75613s

 153   3.52448604e+08  3.52448556e+08  6.64e-07 2.50e-07  2.73e-06  76121s

 154   3.52448596e+08  3.52448596e+08  2.26e-08 5.22e-07  2.77e-09  76620s

Barrier solved model in 154 iterations and 76620.64 seconds

Optimal objective 3.52448596e+08

Root crossover log...

  402702 DPushes remaining with DInf 0.0000000e+00             76643s

  214782 DPushes remaining with DInf 0.0000000e+00             76648s

  176073 DPushes remaining with DInf 0.0000000e+00             76653s

  164960 DPushes remaining with DInf 0.0000000e+00             76658s

  161490 DPushes remaining with DInf 0.0000000e+00             76663s

  159733 DPushes remaining with DInf 0.0000000e+00             76668s

  158007 DPushes remaining with DInf 0.0000000e+00             76678s

  153775 DPushes remaining with DInf 0.0000000e+00             76695s

  151526 DPushes remaining with DInf 0.0000000e+00             76706s

  150603 DPushes remaining with DInf 0.0000000e+00             76715s

  149439 DPushes remaining with DInf 0.0000000e+00             76725s

  148313 DPushes remaining with DInf 0.0000000e+00             76735s

  147185 DPushes remaining with DInf 0.0000000e+00             76744s

  145915 DPushes remaining with DInf 0.0000000e+00             76754s

  144801 DPushes remaining with DInf 0.0000000e+00             89581s

  143921 DPushes remaining with DInf 0.0000000e+00             89590s

  143041 DPushes remaining with DInf 0.0000000e+00             89603s

  142161 DPushes remaining with DInf 0.0000000e+00             89616s

  141281 DPushes remaining with DInf 0.0000000e+00             89636s

  140401 DPushes remaining with DInf 0.0000000e+00             89655s

  139521 DPushes remaining with DInf 0.0000000e+00             89676s

  138641 DPushes remaining with DInf 0.0000000e+00             89690s

  137761 DPushes remaining with DInf 0.0000000e+00             89703s

  136881 DPushes remaining with DInf 0.0000000e+00             89717s

  136001 DPushes remaining with DInf 0.0000000e+00             89733s

  135121 DPushes remaining with DInf 0.0000000e+00             89752s

  134241 DPushes remaining with DInf 0.0000000e+00             89772s

  133361 DPushes remaining with DInf 0.0000000e+00             89796s

  132481 DPushes remaining with DInf 0.0000000e+00             89807s

  131481 DPushes remaining with DInf 0.0000000e+00             89819s

  130545 DPushes remaining with DInf 0.0000000e+00             89831s

  129665 DPushes remaining with DInf 0.0000000e+00             89845s

  128785 DPushes remaining with DInf 0.0000000e+00             89864s

  127905 DPushes remaining with DInf 0.0000000e+00             89887s

  127025 DPushes remaining with DInf 0.0000000e+00             89910s

  126145 DPushes remaining with DInf 0.0000000e+00             89942s

  125265 DPushes remaining with DInf 0.0000000e+00             89979s

  124385 DPushes remaining with DInf 0.0000000e+00             90010s

  123505 DPushes remaining with DInf 0.0000000e+00             90045s

  122625 DPushes remaining with DInf 0.0000000e+00             90058s

  121745 DPushes remaining with DInf 0.0000000e+00             90076s

  120865 DPushes remaining with DInf 0.0000000e+00             90101s

  119985 DPushes remaining with DInf 0.0000000e+00             90130s

  119105 DPushes remaining with DInf 0.0000000e+00             90167s

  118225 DPushes remaining with DInf 0.0000000e+00             90224s

  117345 DPushes remaining with DInf 0.0000000e+00             90258s

  116465 DPushes remaining with DInf 0.0000000e+00             90302s

  115585 DPushes remaining with DInf 0.0000000e+00             90329s

  114705 DPushes remaining with DInf 0.0000000e+00             90406s

  113825 DPushes remaining with DInf 0.0000000e+00             90443s

  112945 DPushes remaining with DInf 0.0000000e+00             90475s

  112065 DPushes remaining with DInf 0.0000000e+00             90520s

  111185 DPushes remaining with DInf 0.0000000e+00             90577s

  110305 DPushes remaining with DInf 0.0000000e+00             90610s

  109425 DPushes remaining with DInf 0.0000000e+00             90631s

  108545 DPushes remaining with DInf 0.0000000e+00             90660s

  107665 DPushes remaining with DInf 0.0000000e+00             90720s

  106785 DPushes remaining with DInf 0.0000000e+00             90740s

  105905 DPushes remaining with DInf 0.0000000e+00             90759s

  105025 DPushes remaining with DInf 0.0000000e+00             90785s

  104145 DPushes remaining with DInf 0.0000000e+00             90805s

  103265 DPushes remaining with DInf 0.0000000e+00             90831s

  102385 DPushes remaining with DInf 0.0000000e+00             90858s

  101505 DPushes remaining with DInf 0.0000000e+00             90881s

  100625 DPushes remaining with DInf 0.0000000e+00             90902s

   99745 DPushes remaining with DInf 0.0000000e+00             90916s

   98865 DPushes remaining with DInf 0.0000000e+00             90935s

   97861 DPushes remaining with DInf 0.0000000e+00             90947s

   96981 DPushes remaining with DInf 0.0000000e+00             90973s

   96101 DPushes remaining with DInf 0.0000000e+00             91003s

   95221 DPushes remaining with DInf 0.0000000e+00             91028s

   94341 DPushes remaining with DInf 0.0000000e+00             91042s

   93461 DPushes remaining with DInf 0.0000000e+00             91056s

   92581 DPushes remaining with DInf 0.0000000e+00             91069s

   91701 DPushes remaining with DInf 0.0000000e+00             91080s

   90821 DPushes remaining with DInf 0.0000000e+00             91092s

   89564 DPushes remaining with DInf 0.0000000e+00             91109s

   88164 DPushes remaining with DInf 0.0000000e+00             91122s

   87284 DPushes remaining with DInf 0.0000000e+00             91140s

   86404 DPushes remaining with DInf 0.0000000e+00             91159s

   85524 DPushes remaining with DInf 0.0000000e+00             91181s

   83772 DPushes remaining with DInf 0.0000000e+00             91208s

   82551 DPushes remaining with DInf 0.0000000e+00             91225s

   81427 DPushes remaining with DInf 0.0000000e+00             91240s

   79878 DPushes remaining with DInf 0.0000000e+00             91257s

   77838 DPushes remaining with DInf 0.0000000e+00             91276s

   75082 DPushes remaining with DInf 0.0000000e+00             91296s

   72737 DPushes remaining with DInf 0.0000000e+00             91317s

   70445 DPushes remaining with DInf 0.0000000e+00             91336s

   69100 DPushes remaining with DInf 0.0000000e+00             91351s

   67755 DPushes remaining with DInf 0.0000000e+00             91366s

   66256 DPushes remaining with DInf 0.0000000e+00             91384s

   65011 DPushes remaining with DInf 0.0000000e+00             91401s

   63604 DPushes remaining with DInf 0.0000000e+00             91420s

   62485 DPushes remaining with DInf 0.0000000e+00             91437s

   61105 DPushes remaining with DInf 0.0000000e+00             91453s

   59986 DPushes remaining with DInf 0.0000000e+00             91471s

   58865 DPushes remaining with DInf 0.0000000e+00             91489s

   56612 DPushes remaining with DInf 0.0000000e+00             91511s

   55636 DPushes remaining with DInf 0.0000000e+00             91529s

   53831 DPushes remaining with DInf 0.0000000e+00             91549s

   52902 DPushes remaining with DInf 0.0000000e+00             91564s

   51321 DPushes remaining with DInf 0.0000000e+00             91582s

   50079 DPushes remaining with DInf 0.0000000e+00             91598s

   48727 DPushes remaining with DInf 0.0000000e+00             91613s

   47278 DPushes remaining with DInf 0.0000000e+00             91630s

   46366 DPushes remaining with DInf 0.0000000e+00             91646s

   45465 DPushes remaining with DInf 0.0000000e+00             91664s

   44585 DPushes remaining with DInf 0.0000000e+00             91684s

   43705 DPushes remaining with DInf 0.0000000e+00             91703s

   42825 DPushes remaining with DInf 0.0000000e+00             91721s

   41469 DPushes remaining with DInf 0.0000000e+00             91739s

   39595 DPushes remaining with DInf 0.0000000e+00             91755s

   38248 DPushes remaining with DInf 0.0000000e+00             91770s

   37368 DPushes remaining with DInf 0.0000000e+00             91786s

   36211 DPushes remaining with DInf 0.0000000e+00             91802s

   34835 DPushes remaining with DInf 0.0000000e+00             91816s

   33356 DPushes remaining with DInf 0.0000000e+00             91837s

   32476 DPushes remaining with DInf 0.0000000e+00             91855s

   31443 DPushes remaining with DInf 0.0000000e+00             91869s

   30563 DPushes remaining with DInf 0.0000000e+00             91901s

   29633 DPushes remaining with DInf 0.0000000e+00             91919s

   28647 DPushes remaining with DInf 0.0000000e+00             91936s

   27767 DPushes remaining with DInf 0.0000000e+00             91955s

   26783 DPushes remaining with DInf 0.0000000e+00             91971s

   25580 DPushes remaining with DInf 0.0000000e+00             91992s

   24677 DPushes remaining with DInf 0.0000000e+00             92007s

   22385 DPushes remaining with DInf 0.0000000e+00             92026s

   20955 DPushes remaining with DInf 0.0000000e+00             92044s

   19213 DPushes remaining with DInf 0.0000000e+00             92067s

   18333 DPushes remaining with DInf 0.0000000e+00             92111s

   17401 DPushes remaining with DInf 0.0000000e+00             92132s

   15833 DPushes remaining with DInf 0.0000000e+00             92149s

   12415 DPushes remaining with DInf 0.0000000e+00             92172s

   10483 DPushes remaining with DInf 0.0000000e+00             92189s

    7910 DPushes remaining with DInf 0.0000000e+00             92211s

    7030 DPushes remaining with DInf 0.0000000e+00             92284s

    6150 DPushes remaining with DInf 0.0000000e+00             92320s

    4729 DPushes remaining with DInf 0.0000000e+00             92397s

    2216 DPushes remaining with DInf 0.0000000e+00             92669s

    1336 DPushes remaining with DInf 0.0000000e+00             93291s

     456 DPushes remaining with DInf 0.0000000e+00             95494s

       0 DPushes remaining with DInf 0.0000000e+00             97104s

Restart crossover...

 3367340 variables added to crossover basis                    97114s

  402702 DPushes remaining with DInf 0.0000000e+00             97121s

  214782 DPushes remaining with DInf 0.0000000e+00             97128s

  176073 DPushes remaining with DInf 0.0000000e+00             97134s

  164955 DPushes remaining with DInf 0.0000000e+00             97141s

  161487 DPushes remaining with DInf 0.0000000e+00             97150s

  159730 DPushes remaining with DInf 0.0000000e+00             97157s

  158034 DPushes remaining with DInf 0.0000000e+00             97170s

  155624 DPushes remaining with DInf 0.0000000e+00             97193s

  152288 DPushes remaining with DInf 0.0000000e+00             97207s

  151025 DPushes remaining with DInf 0.0000000e+00             97219s

  149733 DPushes remaining with DInf 0.0000000e+00             97233s

  148608 DPushes remaining with DInf 0.0000000e+00             97253s

  147473 DPushes remaining with DInf 0.0000000e+00             97269s

  145429 DPushes remaining with DInf 0.0000000e+00             97298s

  144454 DPushes remaining with DInf 0.0000000e+00             97321s

  143410 DPushes remaining with DInf 0.0000000e+00             97341s

  142530 DPushes remaining with DInf 0.0000000e+00             97360s

  141650 DPushes remaining with DInf 0.0000000e+00             97374s

  140770 DPushes remaining with DInf 0.0000000e+00             97391s

  139890 DPushes remaining with DInf 0.0000000e+00             97420s

  139010 DPushes remaining with DInf 0.0000000e+00             97443s

  138130 DPushes remaining with DInf 0.0000000e+00             97463s

  137250 DPushes remaining with DInf 0.0000000e+00             97484s

  136259 DPushes remaining with DInf 0.0000000e+00             97515s

  135376 DPushes remaining with DInf 0.0000000e+00             97552s

  134496 DPushes remaining with DInf 0.0000000e+00             97581s

  133504 DPushes remaining with DInf 0.0000000e+00             97635s

  132501 DPushes remaining with DInf 0.0000000e+00             97661s

  131621 DPushes remaining with DInf 0.0000000e+00             97744s

  130741 DPushes remaining with DInf 0.0000000e+00             97764s

  129861 DPushes remaining with DInf 0.0000000e+00             97798s

  128981 DPushes remaining with DInf 0.0000000e+00             97839s

  128101 DPushes remaining with DInf 0.0000000e+00             97885s

  127221 DPushes remaining with DInf 0.0000000e+00             97906s

  126144 DPushes remaining with DInf 0.0000000e+00             97933s

  125264 DPushes remaining with DInf 0.0000000e+00             97979s

  124384 DPushes remaining with DInf 0.0000000e+00             98016s

  123504 DPushes remaining with DInf 0.0000000e+00             98069s

  122624 DPushes remaining with DInf 0.0000000e+00             98131s

  121744 DPushes remaining with DInf 0.0000000e+00             98176s

  120864 DPushes remaining with DInf 0.0000000e+00             98224s

  119984 DPushes remaining with DInf 0.0000000e+00             98272s

  119104 DPushes remaining with DInf 0.0000000e+00             98323s

  118224 DPushes remaining with DInf 0.0000000e+00             98403s

  117344 DPushes remaining with DInf 0.0000000e+00             98507s

  116464 DPushes remaining with DInf 0.0000000e+00             98570s

  115584 DPushes remaining with DInf 0.0000000e+00             98709s

  114704 DPushes remaining with DInf 0.0000000e+00             98820s

  113824 DPushes remaining with DInf 0.0000000e+00             98877s

  112944 DPushes remaining with DInf 0.0000000e+00             98953s

  112064 DPushes remaining with DInf 0.0000000e+00             99049s

  111184 DPushes remaining with DInf 0.0000000e+00             99192s

  110304 DPushes remaining with DInf 0.0000000e+00             99329s

  109424 DPushes remaining with DInf 0.0000000e+00             99462s

  108544 DPushes remaining with DInf 0.0000000e+00             99598s

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 1960888 PPushes remaining with PInf 0.0000000e+00            237746s

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 1783821 PPushes remaining with PInf 0.0000000e+00            249113s

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 1595019 PPushes remaining with PInf 0.0000000e+00            255050s

 1370870 PPushes remaining with PInf 0.0000000e+00            268648s

 1271189 PPushes remaining with PInf 0.0000000e+00            269977s

 1073548 PPushes remaining with PInf 0.0000000e+00            277084s

 1009521 PPushes remaining with PInf 0.0000000e+00            284770s

  957214 PPushes remaining with PInf 0.0000000e+00            285046s

  866049 PPushes remaining with PInf 0.0000000e+00            285520s

  811085 PPushes remaining with PInf 0.0000000e+00            286603s

  697347 PPushes remaining with PInf 0.0000000e+00            288438s

  539000 PPushes remaining with PInf 0.0000000e+00            292855s

  426247 PPushes remaining with PInf 0.0000000e+00            295560s

  304299 PPushes remaining with PInf 0.0000000e+00            296286s

  196096 PPushes remaining with PInf 0.0000000e+00            296783s

  112088 PPushes remaining with PInf 0.0000000e+00            297584s

   49650 PPushes remaining with PInf 4.6619055e-05            298054s

    1793 PPushes remaining with PInf 0.0000000e+00            298534s

       0 PPushes remaining with PInf 0.0000000e+00            298543s

  Push phase complete: Pinf 0.0000000e+00, Dinf 7.1139993e-07 298544s

Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time

 10567960    3.5244860e+08   0.000000e+00   4.889873e-04 298553s

 10568130    3.5244860e+08   0.000000e+00   0.000000e+00 298664s

 10568130    3.5244860e+08   0.000000e+00   0.000000e+00 298690s

 10568130    3.5244860e+08   0.000000e+00   0.000000e+00 298704s

And it has been at his point last day or so... it hasn't moved 

[Jakob Sch.]

Hi DHABBYC,

Your problem seems to be very large 21m rows is quite heavy. Notice that even the barrier takes about a day to solve your root node. The additional "push phase" is necessary to start the branch-and-bound procedure.
Since the presolve is able to reduce the problem size drastically, I would suggest that you try to come up with some specialized presolving routine for your problem. This would benefit the solving procedure dramatically.


Best regards,
Jakob

[Ed Rothberg]

but when it starts the root relaxation the RAM consumption falls to (app) 4GB, but the machine still is swapping to the maximum amount and all the processors are 100% busy... and it stays that way  like forever (the iterations of the root relaxations took like 20 second each)...

Try setting Method=1 (or 0 or 2).  We're using concurrent LP to solve the root, which makes multiple copies of the model.

Ed